Full patch notes are here

[Crimson-Falcon]

Tank Achievement mounts
But Somebody's Gotta Do It (Paladin) Complete 200 high-level full party duties as a paladin. Item: Warlion Horn
But Somebody's Gotta Do It (Warrior) Complete 200 high-level full party duties as a warrior. Item: Warbear Horn

You actually have to tank 200 parties. So much for those people who said they would just level tank for the mounts.

and where is the problem?

let us be unique for a while